RE: longitude, latitude

Since those strange numbers look static - why not create a function to
return that value, and create a function based index on the function? If
you're not in 8i, you could create additional columns (say, for the value
and it's sqrt), populated and maintained by triggers, and index them. Sounds
like a good idea to me.

hth,

Yosi

> -----Original Message-----> From: jfedock_at_ixl.com [mailto:jfedock_at_ixl.com]> Sent: Friday, October 06, 2000 12:41 PM> To: Multiple recipients of list ORACLE-L> Subject: longitude, latitude> > > Hello all,> > Looking for some advice on the best way to use longitude and latitude.> These values are stored in a table, along with other info.> > In order to get within a certain distance, our developers are > using the> following query. It actually runs well, with a few hints. I > feel that we> need to narrow down the long/lat in the where clause by a > certain distance.> > I'll be the first to admit I don't know much about long/lat. > I'm just trying> to tune this query a bit.> > Anybody else out there deal with this before?> > > SELECT DISTINCT service_provider_id, > SQRT(((37.6715 - LATITUDE)*(37.6715 - LATITUDE) + (-77.5465 -> LONGITUDE)*(-77.5465 - LONGITUDE)) * 5329) DIST> FROM provider_search > WHERE SPECIALTY_CATEGORY_ID = 'PH'> AND ((37.6715 - LATITUDE)*(37.6715 - LATITUDE) + (-77.5465 -> LONGITUDE)*(-77.5465 -LONGITUDE)) * 5329 < 100*100> ORDER BY DIST> > > Thanks.> > John > jfedock_at_ixl.com> -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com> -- > Author: > INET: jfedock_at_ixl.com> > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051> San Diego, California -- Public Internet access / Mailing Lists> --------------------------------------------------------------------> To REMOVE yourself from this mailing list, send an E-Mail message> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in> the message BODY, include a line containing: UNSUB ORACLE-L> (or the name of mailing list you want to be removed from). You may> also send the HELP command for other information (like subscribing).Received on Fri Oct 06 2000 - 11:05:10 CDT